Device and method for detecting refractive index of optical flat based on displacement sensor

Abstract

The invention relates to a device and method for detecting the refractive index of an optical flat based on a displacement sensor, belonging to the technical field of optical measurement. When he existing automatic V-prism refractometer is adopted for detection, two vertical planes are needed to be processed on a measured piece, and the structure of the detection device is complicated. The detection device provided by the invention comprises a light source, an optical imaging system and a CCD (Charge Coupled Device) image sensor which are optically, coaxially and sequentially ranked, wherein the optical imaging system is positioned in a cam cylinder and is in slide pin connection with the displacement sensor; a motor drives the cam cylinder to rotate and controls a processing circuit to be respectively electrically connected with the motor and the displacement sensor and connected with the serial port of an upper computer; and the CCD image sensor is also electrically connected with the upper computer. The detection method provided by the invention comprises the following steps: processing a material to be detected into the measured piece of the optical flat; clearly imaging the infinite distance through the optical imaging system; clearly imaging a close object point A and obtaining the displacement delta S1' of the main surface H of the optical imaging system; adding the measured piece of the optical flat and clearly imaging the refractive image A' of the measured piece of the optical flat in the close object point A to obtain the displacement delta S2'; and computing the refractive index n of the material to be detected according to the displacement delta S1' and the displacement delta S2'.

Description

Technical field [0001] The invention relates to a displacement sensor-based optical flat refractive index detection device and method, and belongs to the technical field of optical measurement. Background technique [0002] The accurate detection of the refractive index of transparent optical materials is a prerequisite for improving the quality of optical instruments. The existing method for detecting the refractive index of optical materials is the V prism method, and the device used is an automatic V prism refractometer. For example, a Chinese invention patent with application number 90102943.2 discloses an automatic V prism refractometer. Light source, condenser, filter, slit, beam splitter, collimating objective lens, V prism, collimating mirror, moiré grating disc, angle encoder, variable speed vibration slit, photomultiplier tube, drive system, control circuit , Signal processing system and computer. The refractometer obtains the refractive index by detecting the deflecti...

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